Health experts have warned that measles could spread further across Wales and to avoid this, parents should get their children vaccinated.
There have been a total of 30 cases of measles and seeing this, parents were urged to get their children immunized. Eleven fresh cases were reported and these have been linked to Ysgol Eifionydd School, in Porthmadog.
Due to low MMR take-up rates, measles have spread and it has been seen that all effected cases did not get their dose or had just one out of the two needed.
Dr Chris Whiteside, a consultant in communicable disease control at Public Health Wales, warned, "This outbreak does have the potential to spread."
As cases of measles in Liverpool are being investigated by Health Protection Agency in England, cases at Gwynedd surfaced.
No link however came up between the city and Porthmadog's outbreak.
Dr Whiteside said, "Measles is highly contagious and spreads very easily. We predicted that the number of cases would rise but it is sad nonetheless that it has risen so sharply."
Experts have stated that measles is a serious and highly contagious viral disease and there are various complications like pneumonia, meningitis and encephalitis. This mostly is seen in kids who are less than five years of age.